Firefox (formerly known as Phoenix and Firebird) is a cross-platform, powerful, usable, and standards-compliant Web browser, based on the Mozilla framework. It is written using the XUL user interface language and was designed to be cross-platform.

The SeaMonkey project is a community effort to develop an all-in-one Internet application suite. It contains an Internet browser, email and newsgroup client with an included Web feed reader, HTML editor, IRC chat, and Web development tools, and is sure to appeal to advanced users, Web developers, and corporate users. It uses much of the Mozilla source code powering such successful siblings as Firefox, Thunderbird, Camino, Sunbird, and Miro.

GNU Wget is a utility for noninteractive download of
files from the Web. It supports HTTP and FTP
protocols, as well as retrieval through HTTP
proxies. It can follow HTML links, download many
pages, and convert the links for local viewing. It
can also mirror FTP hierarchies or only those files
that have changed. Wget has been designed for
robustness over slow network connections; if a
download fails due to a network problem, it will
keep retrying until the whole file has been
retrieved.

Dillo Web browser is a very fast, extremely small
Web browser that's written in C and C++. The
source is around 600 KB, and the static binary is about 980KB. It is a graphical browser built upon FLTK-1.3, and it renders a good subset of HTML and CSS, excluding frames, JavaScript, and JVM support.

CGIProxy is a Perl CGI script that acts as an Internet proxy. Through it, you can retrieve resources that may be inaccessible from your own machine. The user is kept as anonymous as possible from any servers. HTTP and FTP are supported, and optionally SSL. Common uses include censorship circumvention, VPN-like setups, anonymous proxies, personal proxies, and others. Options include text-only browsing (to save bandwidth), selective cookie and script removal, simple ad filtering, access restriction by server, encoded target URLs and cookies, configuration by end user, and much more (currently over 70 config options). Javascript and Flash are fully supported. Messages are in 12 languages so far. Can be installed as a CGI script, a mod_perl script, a FastCGI script, or with its own embedded secure HTTP server. An online demo is available.

GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.